linux-kernel - Re: NULL pointer dereference in selinux_ip_postroute

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Date:	Wed, 08 Aug 2012 15:26:54 -0400
From:	Paul Moore <paul@...l-moore.com>
To:	John Stultz <johnstul@...ibm.com>
Cc:	"Serge E. Hallyn" <serge@...lyn.com>,
	lkml <linux-kernel@...r.kernel.org>,
	James Morris <james.l.morris@...cle.com>,
	selinux@...ho.nsa.gov, Eric Dumazet <edumazet@...gle.com>,
	john.johansen@...onical.com
Subject: Re: NULL pointer dereference in selinux_ip_postroute_compat

On Wednesday, August 08, 2012 12:14:42 PM John Stultz wrote:
> So I bisected this down and it seems to be the following commit:
> 
> commit be9f4a44e7d41cee50ddb5f038fc2391cbbb4046
> Author: Eric Dumazet <edumazet@...gle.com>
> Date:   Thu Jul 19 07:34:03 2012 +0000
> 
>      ipv4: tcp: remove per net tcp_sock
> 
> 
> It doesn't revert totally cleanly, but after fixing up the rejections
> and booting with this patch removed on top of Linus' head the oops on
> shutdown goes away.

Thanks!

It looks the like there is a bug in ip_send_unicast_reply() which uses a 
inet_sock/sock struct which does not have the LSM data properly initialized. 

I'll put together a patch shortly.

-- 
paul moore
www.paul-moore.com

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